/**
  *
  */
 public TestXML() {
  super();
  // TODO Auto-generated constructor stub
 }

 public static void main(String[] args) {
  new TestXML().test();
 }
 public void test(){

   try{
   DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
   dbf.setValidating(true);
   DocumentBuilder db = null;

   db = dbf.newDocumentBuilder();

   ErrorChecker errors = new ErrorChecker();
   db.setErrorHandler(errors);
   Document doc = null;

    doc = db.parse("test.xml");
    System.out.println(doc.getDocumentElement().getNodeName());

   } catch (SAXException e1) {
    // TODO Auto-generated catch block
    e1.printStackTrace();
   } catch (IOException e1) {
    // TODO Auto-generated catch block
    e1.printStackTrace();
   } catch (ParserConfigurationException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }

 }
}
用到的类:
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.SAXParseException;

public class ErrorChecker extends DefaultHandler
{

   public ErrorChecker() {
   }
   
   public void error (SAXParseException e) {
   System.out.println("Parsing error:  "+e.getMessage());
   }

   public void warning (SAXParseException e) {
   System.out.println("Parsing problem:  "+e.getMessage());
   }

   public void fatalError (SAXParseException e) {
   System.out.println("Parsing error:  "+e.getMessage());
   System.out.println("Cannot continue.");
   System.exit(1);
   }
}
下面是这些文件.


我觉得没有错误.可是运行的时候会报出
Parsing error:  Document root element "quotations", must match DOCTYPE root "null".
Parsing error:  Document is invalid: no grammar found.
的两个错误,为什么?望指教.万分感谢!